"I wanted to do A Star is Born because I'm a huge Kurt Cobain fan. That was like my Kennedy assassination when I was a teenager. When he died, it was a huge horrible thing.

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"So I approached A Star is Born, for me the framework was all right, if Kurt Cobain never got to go Unplugged (MTV Unplugged in New York, the band's first release after Cobain's death) and survived and it's 20 years later and it's now, and he wanted to try to do that album with that understanding as this grunge icon.

"That'd be tough to get done if he was past his prime, no longer selling, how does he get that album?"